unit test for buildOrigFromRetentions
unit test for buildOrigFromRetentions

replay/metrictank,raintank/raintank-metric,replay/metrictank,raintank/metrictank,raintank/metrictank,raintank/metrictank,replay/metrictank,raintank/raintank-metric,raintank/raintank-metric,replay/metrictank,raintank/metrictank